An atom has 13 protons and 14 neutrons. What is its mass number?

A significant limitation for early scientists studying the elements was

How much heat is it required to melt 160.0g of water at 0°C

What is special about water as a compound

How are the salt ducts an adaptation to the iguanas' environment?

The continental crust is considered to be rich in iron and magnesium. What conclusion can you reach about the amounts of these elements that are necessary to enrich a substance? Explain.

Is it possible for a balloon with an initial internal pressure equal to 250.0 kPa to naturally expand to four times its initial volume when the temperature remains constant and the atmospheric pressure is 101.3 kPa?

How many atoms of gold (Au) are present in a sample of 2.5 mol Au? A. 1.5 * 1024 atoms Au B. 1.5 * 1023 atoms Au C. 4.2 * 1024 atoms Au D. 4.2 * 1023 atoms Au

what might cause the goldfish population to drop if the temperature moves out of its normal range? Name three things

Why must a chemistry experiments performed in a well ventilated room?

What kind of chemical bond does salt have?